A '''revolution''' (from the Vulgar Latin|Latin
''revolutio'', "a turn around") is a fundamental social change|change
in power or organizational structures that takes place in a relatively short period of time.
described two types of political revolution:
# Complete change from one constitution to another
# Modification of an existing constitution.
[Aristotle, ''The Politics'' V,http://classics.mit.edu/Aristotle/politics.5.five.html accessed 2013/4/24]
Revolutions have occurred through human history
and vary widely in terms of methods, duration, and motivating ideology
. Their results include major changes in culture
, and social institution|socio
Scholarly debates about what does and does not constitute a revolution center on several issues. Early studies of revolutions primarily analyzed events in European history
from a psychological